Grantscat - I've had purple....pink too, and fuschia, and the list goes on, but that was when I was a hairdresser, back in the 80s, waaaaaaay before kids. Nowadays it's more common, so I'd go to a beauty supply and get a temporary color first and make sure you like it.
Luvs, I'm really amazed you got blue, after you'd had black. So often I'd have clients come in and ask for me to lighten their black way up to pale blonde. That usually took at least 2-3 separate applications, and it was hard to make sure the hair didn't dissentigrate. (sp?) The high volume of peroxide is a tricky thing, and if you didn't get the hair past the orange stage (which it hits before you get yellow), you'd get mushy color. And, if you'd get yellow, but didn't take it up to platinum, you'd put on blue and get green.